• The portable hydraulic principle trainer is designed for common courses such as "hydraulic control technology"&comma; "hydraulic and pneumatic transmission"&comma; which is widely used in industrial area and school education&period;• It is suitable for technical secondary school&comma; junior college&comma; vocational school&comma; mechanical engineering major education&period; By the experiment operation and course design&comma; students can understand the structure of hydraulic components&comma; loop control principle&comma; design method and so on&period;• The trainer is mainly composed of training box&comma; oil tank&comma; motor and gear pump &lpar;one body design&rpar;&comma; hydraulic components&comma; oil tubes and so on&comma; with the advantage of small size&comma; light weight&comma; easy to move&period; It is an excellent solution for the traditional teaching way that teachers can only conduct the course in one place&period;